<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
</html>
<script>
    var arr = ''
    function myTypeof(){
        console.log(this);
        return ()=>{
           if(this.length == 0){
               alert('传入参数为空')
           }
           for(var i = 0;i<this.length;i++){
          var aa = Object.prototype.toString.call(this[i]).split('object')
          var bb = aa[1].split(']')
          arr+=bb[0]+"," 
      }
      console.log(arr);
        }
    }
    var obj = [1,'123',[],{}]
  var aa = myTypeof.call(obj)
  aa()
</script>